Not Bug Wrong exchange?

Wanted to use my 50 maple coins and 150 shiny maple coins, bought a spiegelmanns necklace, and he exchanged my shiny coins and not my normal coins, so im not able to get my spiegelmanns necklace of chaos, can you fix that and gimmeh back my 50 shiny coins and take my normal coins?... >.<

 

Once you get to level 51, you can no longer use your normal maple coins, unfortunately.

 

so.... i cant get my chaos neck anymore? you cant refund it? would be nice, because it sucks if i wasted now around 100m lol